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A Method of Energy Spectrum Prediction Based on Main Aftershock Sequence

A prediction method and energy spectrum technology, which is applied in the direction of prediction, instrumentation, electrical digital data processing, etc., to achieve the effect of improving accuracy

Active Publication Date: 2018-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy spectrum models currently proposed by scholars are all based on the main shock acting alone, while ignoring the impact of aftershocks on the structure. Therefore, the proposed energy spectrum model based on the main aftershocks is of great significance for the energy-based seismic design of structures.

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  • A Method of Energy Spectrum Prediction Based on Main Aftershock Sequence
  • A Method of Energy Spectrum Prediction Based on Main Aftershock Sequence
  • A Method of Energy Spectrum Prediction Based on Main Aftershock Sequence

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specific Embodiment approach 1

[0021] Specific implementation mode one: as Figure 7 As shown, an energy spectrum prediction method based on the main aftershock sequence includes the following steps:

[0022] When an earthquake occurs, a large main shock is often followed by many aftershocks. As far as the current stage is concerned, selecting all aftershocks for seismic design is a very difficult and huge project, which increases the amount of calculation to a large extent, but small aftershocks do not have much impact on the structure. In order to simplify the calculation, this paper selects a relatively large aftershock to form the earthquake sequence.

[0023] The ground motions of the main shock and aftershocks should be selected according to the following conditions: (1) The station where the accelerometer is located has sufficient geological and geotechnical information available; (2) The soil-bond interaction can be ignored in the records of the free-field station (3) The peak ground acceleration ...

specific Embodiment approach 2

[0034] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dynamic characteristics of the non-elastic SDOF structure in the step 1 are specifically:

[0035] The period range of the SDOF structure is 0.1-6.0s, the period interval is 0.1s, the damping ratio of the SDOF structure is set to 5%, and the hysteretic rule of the SDOF structure is selected as the ideal elastoplastic (EPP) model;

[0036] The lateral strength of the SDOF structure is determined by the ductility coefficient μ, the value of μ is 2, 3, 4, 5 or 6, and the calculation formula of μ is:

[0037]

[0038] where the x max is the maximum displacement response of the structure under earthquake action, x y is the yield displacement of the structure.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in the described step 2, solve the equation of motion of the inelastic SDOF structure that the base is subjected to horizontal ground vibrations to obtain E I The specific process is:

[0040] The motion equation of the inelastic SDOF structure whose base is subject to horizontal ground motion is:

[0041]

[0042] Where m is the mass of the inelastic SDOF structure, c is the viscous damping coefficient of the inelastic SDOF structure, f s is the restoring force of the inelastic SDOF structure, for v t The second derivative of , the absolute acceleration response of the inelastic SDOF structure, v t is the absolute displacement, v t =v+v g , v is the relative displacement, v g is the earthquake displacement;

[0043] Integrating both sides of formula (3):

[0044]

[0045] put v t =v+v g into formula (4) but can be rewritten as:

[0046]

[004...

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Abstract

The invention discloses an energy spectrum predication method based on a principal earthquake and aftershock sequence. In application of the method disclosed by the invention, the problem that the existing energy spectrum model is based on independent effects of principal earthquakes without considering the influences of the aftershocks on the structure is solved. The method comprises following specific steps: step 1, selecting an inelastic SDOF structure and determining the dynamic characteristics of the inelastic SDOF structure; step 2, according to the dynamic characteristics of the inelastic SDOF structure determined in the step 1, solving the motion equation of the inelastic SDOF structure of a base under horizontal shock so as to obtain EI; step 3, according to the EI obtained in the step 2, solving VE; step 4, according to the VE obtained in the step 3, fitting to obtain an energy spectrum model based on the principal earthquakes and aftershocks. According to the method disclosed by the invention, the value of the input energy can be calculated through the energy spectrum model according to the dynamic characteristics of the structure and the dangerousness levels of the principal earthquakes and aftershocks of the place in which the structure is located. The method disclosed by the invention is applicable to the earthquake engineering field.

Description

technical field [0001] The invention relates to an energy spectrum prediction method based on the main aftershock sequence. Background technique [0002] It is known from the history of earthquakes that a large mainshock is often accompanied by many aftershocks, forming a sequence of mainshock and aftershock earthquakes. For example, in the May 12, 2008 Wenchuan M8.0 earthquake in Sichuan, five aftershocks with a magnitude over 6.0 were recorded before May 31. For many structures damaged by a large main shock, it is impossible to repair them in such a short period of time before the aftershocks. However, the codes of almost all countries in the world only consider the case of a main shock, while ignoring the impact of aftershocks on structures. Therefore, it is very necessary to study the impact of main aftershock sequence earthquake motion on existing structures. [0003] Earthquakes are transmitted to the structure in the form of energy, and the structure dissipates the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06Q10/04G06Q50/26
CPCG06F30/367G06F2119/06G06Q10/04G06Q50/26
Inventor 翟长海籍多发温卫平李爽谢礼立
Owner HARBIN INST OF TECH
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